Just released, the Atmegatron from Soulsby Synthesizers, is an Open Source 8-bit mono synth based on the Arduino platform. There is already alternative software available so it can be reprogrammed as a drum machine, polyphonic synth (4-note paraphonic), SFX, bass synth, lead synth, and since the source code is open source you can experiment with writing your own. “It’s an electronic musician’s dream, combining the sounds of 1980s home computers with the flexibility and power of a modern synthesizer,” say the developers.